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In geometry, a polygon / ˈ p ɒ l ɪ ɡ ɒ n / is traditionally a plane figure that is bounded by a finite chain of straight line segments closing in a loop to form ... - read more

In the first decades, Coxeter and Petrie allowed "saddle" vertices with alternating ridges and valleys, enabling them to construct three infinite folded surfaces ... - read more

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